Firefox 1.5

Sad to say I have had my first significantly negative experience with Firefox with this upgrade. From the Firefox forum it appears to suffer badly from memory leakage. This may be related to my problem where after a few minutes online it simply stops working and won't even restart after closing it down. I don't have the time at the moent to investigate fully and from the Firefox forum it looks as if there is no definitive fix yet anyway, so for the time being I've reverted to an earlier version. Has anyone else managed to get it working consistently?